Amazon.com: HQRP AC Adapter w/ 9V Battery Snap Connector Compatible with Boss CS-3 Compression Sustainer DS-1 Distortion MT-2 Metal Zone RC-3 Loop Station RV-5 Effects Pedal w/Battery Clip Converter + Euro Plug :
9V Battery Clip to DC Plug Connector 2.1 x 5.5 mm Tip Positive 5" Adapter Cord
2p 9V Battery Clip Converter for Pedal Power Cable Snap Connector 2.1x5.5mm Plug | eBay